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利用启动子陷阱技术，鉴定和分离了一个在拟南芥菜的维管束和花药的绒毡层细胞中高度特异性表达的基因。经鉴定，该基因全长为４．４ｋｂ，编码一种与ＲＮＡｈｅｌｉｃａｓｅＡ高度同源的蛋白。组织化学和原位杂交的证据表明，该基因只在维管束中少数细胞内转录、翻译并在原位发挥作用。
A promoter-trap technique was used to identify and isolate a gene that is highly specific for expression in the tapetum and anther cells of the Arabidopsis thaliana. The full length of the gene was identified as 4.4kb, encoding a highly homologous protein with RNAhelicaseA. Evidence from histochemistry and in situ hybridization suggests that the gene transcribes, translates and functions in situ only in a few cells in the vascular bundle.